I sliced the model with Cura, printed it in PLA with settings as below: 0.2mm layer,5% infill,90mm/s printing speed.
I only set support for the body.
I scaled all the parts 70%.I think no scale would work better.And I suggested to print this model with no scale.
For easier assembling,I scaled the pins 5% smaller than other parts.
The result came out well. I like it.